I had one late hatch "hold-out" where yesterday (day 23) I still saw an air bubble and could see the chick moving inside. No pip, and no peeping but plenty of moving.
Tonight, I checked and there is no movement that I can see, no air bubble, no pip, and no peeping.
I had this happen. I chip a little hole in the egg. If I can see it moving I will leave it alone for a while. If it does not progress I will continue to chip away the shell slowly. I have had a couple chicks that needed a little assistance. But be prepared the ones that need help sometimes have issues. One of mine has breathing issues and is small. She needed extra attention in the beginning but now is 11 weeks and hanging with the crew.